Textile drawing mechanism



.June 2l, 1960 F, KUBLER 2,941,263

TEXTILE DRAWING MECHANISM Filed March 12, 1958 INI/[N709 ff/ WM wfTEXTILE DRAWlNG MECHANISM Friedrich Kbier, Stuttgart-Bad Cannstatt,Germany, as-

signor to SKF Kugeliagerfabrilren Gescilschaft mit beschrankter Haftung,Schweinfurt, Germany Filed Mar. 12, 1958, Ser. No. 720,86!

Claims priority, application Germany Mar. 15, 1957 4 Claims. (Cl.19--135) This invention relates generally to drawing mechanisms fortextile machinery, for example, spinning frames and the like, and, moreparticularly, is directed toward improvements in drawing mechanisms ofthe kind wherein twin top rolls, that is, assemblies of two axiallyaligned top rolls at the opposite ends of a roller shaft, cooperate withlower rolls which are rotatably supported in an underframe of themechanism, and the twin top rolls are individually suspended from an armor carrier which is pivoted on a iixed support for movement betweenoperative and inoperative positions, with springs acting be tween thepivoted arm and the top rolls suspended therefrom to urge the lattertoward the related lower rolls, while releasable locking means isprovided for retaining the pivoted arm in its operative position againstthe reactions of the forces of the springs weighting the top rolls. Indrawing mechanism, particularly for spinning frames, it is necessarythat the spacing between the nip points formed by the lines of Contactbetween the individual top rolls and the corresponding bottom rollsshould be variable either for the purpose of adapting the drawingmechanism for the processing of dilerent iibrous materials, for example,materials having different staple lengths, or in order rto obtain ageneral improvement in the drawing conditions. The weighting orpressures acting on the individual top rolls also determine the qualityof the yarn to be produced so that it is frequently necessary rto varysuch weighting or pressures and also to vary the spacing between the nippoints for each drawing mechanism on the complete spinning machine.

Although it is possible with existing drawing mecha'- the spacing of thenip points has to be varied on all of the drawing mechanisms of amachine or at one side of the machine, it is necessary to halt theoperation of the entire machine, or at least of one side thereof, for aprolonged period, since the adjustment of the top rolls in each drawingmechanism is an involved and time-consuming operation and has to beeffected with the utmost care in order to obtain the same conditions forall drawing mechanisms and the production of uniform yarn. Further, ithas been found that, even with the exercise of the utmost care,adjustment of the drawing mechanism with the latter situated on thespinning or other textile machine frequently resul-ts in faulty ornon-uniform setting.

Furthermore, with the known drawing mechanisms, a breakdown or failureoccurring in one of the drawing mechanisms of a spinning or othertextile machine renders the entire machine, or at least a major portionthereof, inoperative for a lengthy period in the event that the failurecannot be corrected with the drawing mechanism situ-Y ated on themachine.

Accordingly, it is an object of the present inventionto provide adrawing mechanism which permits rapid adjustment of the distance betweenthe nip points of the top and lower rolls and also of the weightingofthe individual top rolls, so that operation of the associated;

. spinning or other textile machine needs to be halted for nisms toeffect adjustment of the spacing between the tween the top rolls ischanged, so that the possible variai tion of the pressures acting on thetop rolls and changes in the spacing between the top rolls are dependentupon each other. Although drawing mechanisms .have been proposed whereinthe top rolls are carried by individually weighted saddles and a simplemeans is provided for adjustingthe spacing between the top rolls, it isnevertheless necessary, in such existing mechanisms, to halt the opera.tionof the drawingmechanism on the spinning or other machine in order tovary the pressures acting on the top rolls. t Thus, in all previouslyexisting drawing mechanisms, variations'of the spacing between the toprolls and ofthe weighting or pressures acting on the top rolls have tobe. carried Vout with the. entire drawing mechanismsituatedV on thespinning or other textile machine. Accordingly',l if

the shortest possible time in order to elect such adjustments.

In accordance with an aspect of this invention, a textile drawingmechanism comprises a xed support or bracket, a carrier arm including afirst component pivotallv mounted on the fixed support and a secondcomponent releasably secured to the rst component in longitudinalalignment with the latter to overlie the drawing field when the carrierarm is disposed in its operative position where it can be releasablylocked by a conventional locking means, such second component of thecarrier arm having a section which is swingable laterally in a planeparallel to the plane of the drawing field and which carries the twintop rolls and the weighting means acting upon the latter.

With the above arrangement embodying the invention, the second componentof the carrier arm which includes the section carrying the twin toprolls and the weighting means therefor can be easily removed from, andconnected to, the first component of vthe carrier arm which ispermanently pivotally connected to the fixed support or bracket. Thus,each drawing mechanism can be provided with additional interchangeableremovable components of the'carrier arm thereof, so that adjustments ofthe spacing and weighting of the top rolls can be eifected on one of theadditional removable components of a drawing mechanism, and the latter,following such adjustment, can be installed in place of the previouslyused removable component. IIt is apparent that such exchanging of theremovable components of a drawing mechanism can be quickly effected, sothat the operation of the associated spinning or other textile machineneed be halted for only a very short period when it is necessary toadjust the conditions of the drawing mechanism. Since the twin top rollsand the weighting means therefor are carried by a removable component ofthe carrier arm, the top rolls of several additional removablecomponentsV for each drawing mechanism may be adjusted to have differentpredetermined values, so that a removable component of the carrier armhaving its top rolls suitably adjusted, as to spacing and weighting, isalways available for substi tution for the removable componentpreviouslyl'on the drawing mechanism, and such adjustment of 'thespacin'g and weighting of the top rolls of the removable additionalcomponents can be effected'v in a shopremote fromith'e fectiife drawingmechanism, thereby greatly reducing theY period during which thespinning or' other textile machine needs Ito be inoperative as it is nolonger necessary to halt the operation of the machine for the protractedperiod necessary for repairing the defective drawing mechanism.

The provision of a laterally swingable section onthe removable componentof the carri-er arm inv a drawingr mechanism embodying this inventionhas the advantage of ensuring the automatically accurate adjustment ofall of the top rolls in relation to the corresponding bottom rollssothatthe axesof the top and bottom rolls areV always parallel. InI apreferred embodiment of the invention, such lateral swinging of asection of the removable component is made possible by a frictionlessjoint, for example, in the form of a thin resilient plate, connectingthe swingable section to the remainder of the removable component of thecarrier arm.

'In accordance with still another aspect of the invention, the removablecomponent of the carrier arm is longitudinally adjustable relative tothe component of thecarrier arm which is permanently pivoted on the xedsupport or bracket, so that longitudinal adjustment of the removablecomponent makes it possible to vary the positions of all of the top`rolls relative to thecorresponding bottom rolls without requiringdisplacement of eitherthe usual supporting bar carryingI the fixedsupports or brackets of the drawing mechanisms or of the bottom rolls ofthe drawing mechanisms.

Still another feature of the drawing mechanism embodying the presentinvention isY the provision of a protective cover extending over bothcomponents of the carrier arm to avoid the accumulation of lint aboutthe carrier arm, such protective cover being secured inl position by thesame means employed for releasably securing thercmovable component ofthecarrier arm to the component of the latter which -is permanently pivotedonthe fixed' support.

In accordance with still another aspect ofthe invention, thelaterallyswingable section of the removable component of the carrier armis formed with a longitudinal extending slot, and a holder for each setofV twin top rolls is adjustably and removably received in suchslot topermit adjustment of the spacing between the sets of twin top rollsy aswell as to facilitate the replacement of any worn or defective set oftwin top rolls, eachsetl of twin top rolls being mounted in a housingwhich is pivoted on arms depending from the related holder and whichcarries a stop engageable with the arms when the carrier arm is releasedfor upward movement from its operative position, thereby tolimit theswinging of the housing in the direction moving the related set of twintop rolls away from the carrier arm. Preferably, inaccordance with theVinvention, the stops associated with the several sets of twin top rollsarer arranged so that the housingv accommodating the set of twin toprollsfurthest from the swinging or pivoting axis of the carrier arm,that is, the foremost set of twin top rolls,- can swing through anangle. greater than the. permittedv swinging ofv the. other housings.Thus, upon release. of the usual lockingy means retaining; the carrierarm in its operative position, for example, during a prolongedinoperative of the associated spinning or othertextile machine, allofthe sets of twin top rolls, other than the above mentioned foremost setof twin top rolls, are lifted from the associated bottom rolls, while.the` foremost. twin top continue to rest on the bottom rolls under therelaf tively low pressure exerted bythe weight of the` carrier 4 arm,thereby to prevent the extension of the twist of the already drawnyarninto the drawing iield.

The above, and other objects, features and advantages of the invention,will be apparent in the following detailed description of illustrativeembodiments thereof which is to be read in connection with theaccompanying drawing forming a part hereof, and wherein:

Fig. l is a longitudinal sectional view of the carrier y arm andassociated parts of a drawing mechanism embodying the present invention;

Fig. 2 is a horizontal sectional view taken along the line lI--II ofFig. l; and

Fig. 3 is a fragmentary, longitudinal sectional view, similar to aportion of Fig. l, but showing another embodiment of the invention.

Referring to the drawings in detail, and initially to Figs. l and 2thereof, it will be seen that a iixed support orbracket 2 is suitablysecured, for example, by a clamping bolt 3, to a supporting bar 1provided on a spinning or other textile machine, and that the iixed'ysupport 2 includes side members having upwardly extending portions whichcarry a pin 4 extending therebetween.

The drawing mechanism embodying this invention in cludes a carrier armmade up of a rst component 6 which is pivotally mounted on the pin -4and a second component which is generally identiied by the referencenumeral 5 and is removably secured to the pivotally mounted component 6.A conventional locking device-I (not shown) may be provided forpreventing unintentional upwardswinging of the component 6 about pin 4',withI carrier arm in the illustrated operative position..

The pivotally mounted component 6 of the carrier arm is= formd with asubstantially U-shaped, downwardly opening cross-section, and theremovable component 5 includes a section 14` which also has adownwardlyl opening, U-shaped cross-section and 'which ts longitudinallyinto the component 6. A suitable securing assembly 15 releasably securessection 14- of the removable com.- ponent '5 to the pivoted component 6of the carrier arm. In the embodiment of the invention illustrated inFigs. l and 2", such securing means 15 is shown to includer a hollow,internally tapped, flat-sided female member extending throughcorrespondingly fiat-sided openings in the section 14 and the component6 to avoid turning of the femaleV component, and a machine screw whichpasses through an opening of a lateral reinforcement of the section 14and is threaded into the abovev described female member.

The removableI component 5 ofthe carrier arm further includes: anelongated section 14' having an upwardly opening, U-shaped cross-sectionand extending longitudinally from the section 14, with the adjacent endsof the sections14 and 14' being joined together by africtionless jointwhich permits lateral swinging of the section 14 relative to the section14. Preferably', the frictionless. joint. between the sections 14 and 14is formed by a thin sheet or plate 16 of flexible or resilient steelwhich is held between the adjacent. ends of the sections y14 and '14 byrivets, screws or the like.

Thev bottom of section 14' of the removable component of thecarrier armis provided with a central elongated slot 7, and a holder 8 for each setof twin top rollsis slidable along the lower surface of the bottom ofsecti'on y14 and is formed with upstanding lugs-8' at the opposite. endsof the holder projecting slidably into the slot 7 for ensuringparallelism of the axes of the several sets of twin top rolls. Eachholder 8 is releasably secured to. the` section 14' by a screw 12extending from theholder through the slot 7 and receiving a nut so that,when the nut ou the-screw 12 is loosened, the related holderl 8 may bemoved along the section 14' in order to adjust the spacing between thesets4 of twin top rolls'.

Bach holder 8. has depending arms 9 which, at their lower ends, carry apin 10l on which a, housing 11. is

gaat,

pivotally mounted. Each housing or saddle 11 is intended to accommodatethe bearing of a related set of twin ltop rolls which are`represented inbroken lines, as at 13 on Fig. 1, and which may be constructed in themanner disclosed in United States Letter Patent No. 2,740,164, issuedApril 3, 1956, to E. F. Schmid and I. Raible. Each set of twin top rolls13 is weighted or urged in the direction away from the carrier arm byone or more weighting helical springs Z1 interposed between the relatedholder 8 and saddle-shaped housing 1=1.

Further, each housing 11 is provided with an integral stop 20 or 20'disposed in back of the related arms 9 and engageable with the latter inorder to limit the swinging of the housing by the associated springs 21,that is, in the direction moving the twin top rolls 13 downwardly awayfrom the carrier arm. In accordance with the present invention, the stop20 of the housing 11 supporting the foremost set of twin top rolls, thatis, the set of twin top rolls disposed furthest from the pivoting axisof the carrier arm defined by the pin 4, is disposed so that the relatedhousing 11 can swing through a greater angle, as represented by thebroken lines on Fig. 1, than the angular movement of the other housings11 permitted by the related stops 20. Thus, upon release of theconventional locking device (not shown) associated with the component 6of the carrier arm, thereby to permit upward movement of the carrier armfrom its illustrated operative position, the foremost twin top rolls 13of the drawing mechanism will continue to rest upon the related bottomrolls (not shown), while the other sets of twin top rolls 13 are liftedfrom the bottom rolls associated therewith. Accordingly, duringprolonged inoperative periods of the associated spinning or othertextile machine, all of the twin top rolls, other than the foremost twintop rolls, can be raised from the related bottom rolls, while theforemost set of twin top rolls continues to rest on the related bottomrolls with the relatively light pressure resulting merely from theweight of the carrier arm in order to prevent the extension of the twistof the already drawn yarn into the drawing field.

In order to avoid the accumulation of lint about the carrier arm, thedrawing mechanism is further provided with a protective cover 17 whichextends around the components and 6 of the carrier arm and which issecured in position by the securing assembly 15 provided for releasablyattaching the removable component 5 to the pivoted component 6.

Referring now to Fig. 3, it will be seen that the embodiment of theinvention there illustrated is generally similar to that described abovewith reference to Figs. 1 and 2, and that the several parts thereof areidentified by the same reference numerals employed in connection withthe description of the corresponding parts of the `first describedembodiment. The drawing mechanism of Fig. 3 differs from that of Figs. 1and 2 only in that the removable component 5 of the carrier arm isadjustable longitudinally with respect to the component 6 which ispermanently pivoted on the pin 4. In order to permit such longitudinaladjustment of component 5 relative to component 6, the web, or laterallyextending portion of the U-shaped component 6 is formed with alongitudinal slot 18, and the securing assembly 19 for removablyattaching component 5 to component 6 includes a screw passing throughthe protective cover 17, the slot 18 and an opening in a cross-bracingmember of the section 14 of component 5, and a nut threaded on suchscrew below the cross-bracing member of section 14. Thus, when thesecuring assembly 19 is loosened, the component 5 of the carrier arm canbe adjusted longitudinally relative to the component 6 thereby to varythe positional relationship of all of the sets of twin top rolls 13suspended from the component 5 relative to the associated bottom rolls(not shown), without requiring displacement either of the supporting rod1 or of the individual bottom rolls.

effected in the spacing of the twin top rolls 13 orin the weightingthereof, or in both the spacing and Weighting and weighting. Thus, thespacing and weighting of the top rolls can be adjusted at a locationremote from the spinning or other textilemachine in order to ensureaccuracy in effecting the necessary adjustments, and in order to avoid alengthy period of inoperativeness of the spinning machine during changesinthe conditionsu of the drawing mechanisms thereof. Further, by reasonof the removable component 5 of the carrier arm, a breakdown or failurein the drawing mechanism can be quickly and easily corrected merely byreplacing such removable component of the carrier arm with a newcomponent having properly functioning top rolls suspended therefrom.

When it is desired to alter or adjust the spacing between the sets oftwin top rolls 13, it is only necessary to loosen the securing means 12and -to move the holders 8 along the slot 7 to the desired newpositions, whereupon the securing means 12 can tbe again tightened. Inorder to facilitate the adjustment of the spacing between the top rolls,suitable markings may be provided along the edges of the slot 7 forindicating the spacing between the related top rolls. Adjustment of theweighting of the sets of twin top rolls can be effected merely byreplacing the weighting springs 21 or by inserting suitable shims-between the springs and either the related holder 8 or housing 1i1.Since .the component S of the carrier arm is removable, such replacementof the weighting springs 21 or insertion of shims for varying the forcesexerted thereby can be effected at a location -remote from the spinningor other machine, thereby to greatly facilitate the adjustment of theweighting forces.

Although illustrative embodiments of the invention have been describedin detail herein with reference to the accompanying drawing, it is to beunderstood that the invention is not limited Ito such preciseembodiments, and that various changes and modifications may be effectedtherein without departing from the scope or spirit of the invention,except as defined in the appended claims.

What is claimed is:

1. A textile drawing mechanism comprising a fixed support, la carrierarm including first and second components and means releasably securingsaid components to each other in longitudinally aligned relationship,means pivotally mounting said first component of the carrier arm on saidfixed support so tha-t the carrier arm can swing between an operativeposition, where said second component overlies a drawing field, and araised inoperative position, said second component having a section ofsubstantial length, a frictionless joint connecting said section to theremainder `of the second component to permit free lateral swinging ofsaid section, sets of twin top rolls, means suspending said sets of twintop rolls from said section of the second component of said carrier arm,and means weighting said top rolls.

2. A textile drawing mechanism as in claim 1; wherein said frictionlessjoint includes a thin flexible plate, and means joining said plate tosaid section and -to said remainder of the second component,respectively.

3. A textile drawing mechanism as in claim 1; wherein said laterallyswingable section of the second component has a longitudinally extendingslot therein, and said means suspending said sets of twin top rollsincludes a holder for each of the sets of twin top rolls, and releasablemeans for each holder extending through said Slot of said section todetachably secure the related holder to said section while permittingmovement of the related holder along said section for adjusting thespacing between the sets of twin Itop rolls.y

` 4. A textile drawing mechanism as in claim 3; wherein said meanssuspending said sets of twin top rolls further includes arms dependingfrom each holder, a housing for each set of twin top rolls pivotallymounted on said arms depending from the related holder to swing about anaxis parallel to the swinging axis of said .car- Iier arm and stop meanson said housing engageable with said arms of the related holder to limitthe swinging of saidy housing in. the direction moving the related setof twin top rolls away from the carrier arm under the iniluence of saidweighting means,'said stop means ofthe housing for the set of twin toprolls disposed furthest l5 from said swinging axis of the carrier armbeing disposed to permit swinging of the related housing in said direc?tion 'to an angular lextent which is substantially greater than thepermitted swinging ofthe housings for the other sets of twin toprolls. l

References Cited' in the file of this patent UNITED STATES PATENTS2,644,988 Haythornthwate et al. July 114, 1953 2,675,587 Raible et a1Apr. 20, 1954 2,834,995 Calvert et al May 20, 1958 2,834,996Rulon-Miller et al?. May 20, 1958 2,850,770 Noguera Sept. 9, 1958

